Seven undescribed steroidal glycosides with CYP3A4 inhibitory activity from the stems of Marsdenia tenacissima - Bian-Xia Xue; Dong Zhang; Qing-Xia Li; Ze-Min Ou; Chun Li; Li-Hua Yan; Xiao-Qian Liu; Zhi-Min Wang (Phytochemistry, 2026)